Finally the day came when The Chief and the boys started work. A drain pipe should be laid ordinarily anywhere from twenty inches to three feet deep. One may dig or plough to make the trench. It is wise to dig as narrow a trench as possible and so lift as little soil as possible. Then, too, the bed of the drain should slope gradually from the upper or highest point to the lowest. The drop in level should be about four inches per hundred feet. So the boys had to consider just this. This is the way they "sighted" to get the drop in level. They drove a stake into the ground at some twenty feet from the place where the drain was to begin. Previously a cord had been stretched from one end of the centre of the field to the other end. Since the centre of the field seemed to be the place for the deposit of water the drain was to go directly through the centre. If you ever have a piece of draining to do the problem may not be so simple as this. You may find several natural drainage areas. Then you must lay drains through these. Or instead of separate drains make side ones which empty into a main drain. Going back again to the "sighting" for the drain bed level--the boys have driven a stake into the ground. It stands five feet above the ground level. If a tree had been in line with the drain line this might have been used and saved driving the stakes. Across the stake, at right angles to it, a board with a perfectly straight edge was nailed. This board was about four feet long, one end pointed at the drain line. At the other end Jay placed his eye looking across this to where Albert had driven stakes. One stake had been driven into the ground at the beginning where the drain was to be dug; another at the extreme end or outlet of the drain. Albert stood at the first stake and ran a little piece of paper slowly up and down the stake until Jay raised his hand. This meant that the paper was on the same line with the sighting board. Then Albert ran to the other stake and did the same. The difference in these two points gives the difference in level of the ground. Albert measured from the ground to his mark on the first stake, and, doing the same in the case of the other stake, found the difference to be eight inches. This was too great a drop. Then the boys drove two stakes in between these others and did the same work of level finding. From stake 1 to 2, or for the first twenty-five feet there was no difference in level. For the first fifty feet there was four inches drop; for the next twenty-five feet, five inches rise; and the last twenty-five feet, six inches drop. They marked all this on the stakes in order to make sure they got the level right. The bed must, you see, drop one inch for every twenty-five feet. For the first fifty feet of the line the drop was just twice too much; then came the abrupt rise and drop.